[50mhz] 5 over 5 stacking recommendations

[Ray Brown]

----- Original Message ----- 
From: "WD0T" <wd0t at mncomm.com>
To: <50mhz at mailman.qth.net>
Sent: Saturday, May 05, 2007 8:44 PM
Subject: [50mhz] 5 over 5 stacking recommendations


Greetings all, first time posting here!

I have a question on recommended stack spacing, for using 2 cushcraft 5 element 6m yagis, looking to put 2 up on a short crank up
tower for the June VHF contest.  By short tower I mean a 30ft to the lower 6m antenna. I am talking about stacking one above the
other.

What would you recommend for stack spacing using 2 of the CC 5 element, stock standard yagis?  Max gain would be nice, but also I
need to not get crazy in terms of spacing distance.  I have seen in some places recommendations for .6 wavelength spacing for lower
sidelobes, however I have also read that each type of antenna and height needs to be modeled to arrive at optimum spacing.



  Howdy! Glad to see a question that I can answer! :-)

  What I have at home is a pair of MFJ-1762 3-element 6m beams, in phase.
Their manual gives instructions on how to construct a harness that can be used
to feed the two antennas. The major trick is to space them 5/8 wave, or about
11'6" apart, then make sure you attach the center of one coax to the right side
of the driven element (ground to the other side), while connecting the center of
the other coax to the left side of the driven element on the other antenna.
The instructions here are pretty clear...

http://www.mfjenterprises.com/man/pdf/MFJ-1762.pdf

  Good luck!

                _Ray_        KBØSTN